Settings for material number conversion not found using ODP source system

We are using ODP source system in BW for extracting data from ECC, we are using both ODP and RFC connection in parallel with different clients in the source system to extract data from ECC.

ECC client 010 = RFC connection to ECC

ECC client 100 = ODP connection to ECC

When transporting ODP datasource and transformation to BW quality, we are facing below error with return code 12.

Settings for material number conversion not found RC = 12

I searched SDN for similar issue and found that we need to maintain the material length in OMSL tcode, we already did that and the TMCNV table in ECC quality and BW quality are matching. Is there anything else we need to do to solve this issue? Any pointers will be helpful.